Spatial expression pattern of Dll . A. Frontal view. B. Lateral view. Embryos (around 25-30 h after ovulation) show strong Dll signals in first to fifth thoracic limbs, distal portion of second antenna, and labrum, and weak Dll signals in first antenna, mandible and first maxillae. An1, first antenna; An2, second antenna; Lb, labrum; Mn, mandible; Mx1, first maxilla; T1-T5, first to fifth thoracic limb. Scale bar = 100 μm.